<?php

namespace App\Services;

use CTApi\CTConfig;
use CTApi\Models\Events\Event\EventAgendaRequest;
use CTApi\Models\Events\Event\EventRequest;
use CTApi\Models\Events\Song\SongRequest;
use Closure;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\Config;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;
use Throwable;

class ChurchToolsService
{
    private bool $apiConfigured = false;

    public function __construct(
        private readonly ?Closure $eventFetcher = null,
        private readonly ?Closure $songFetcher = null,
        private readonly ?Closure $agendaFetcher = null,
        private readonly ?Closure $eventServiceFetcher = null,
    ) {
    }

    public function sync(): array
    {
        $startedAt = Carbon::now();

        try {
            $eventsSummary = $this->syncEvents();
            $songsCount = $this->syncSongs();

            $summary = [
                'services_count' => $eventsSummary['services_count'],
                'songs_count' => $eventsSummary['songs_count'],
                'matched_songs_count' => $eventsSummary['matched_songs_count'],
                'unmatched_songs_count' => $eventsSummary['unmatched_songs_count'],
                'catalog_songs_count' => $songsCount,
            ];

            $this->writeSyncLog('success', $summary, null, $startedAt, Carbon::now());

            return $summary;
        } catch (Throwable $exception) {
            $summary = [
                'services_count' => 0,
                'songs_count' => 0,
                'matched_songs_count' => 0,
                'unmatched_songs_count' => 0,
                'catalog_songs_count' => 0,
            ];

            $this->writeSyncLog('error', $summary, $exception->getMessage(), $startedAt, Carbon::now());

            throw $exception;
        }
    }

    public function syncEvents(): array
    {
        $events = $this->fetchEvents();

        $summary = [
            'services_count' => 0,
            'songs_count' => 0,
            'matched_songs_count' => 0,
            'unmatched_songs_count' => 0,
        ];

        foreach ($events as $event) {
            $eventId = (int) ($event->getId() ?? 0);
            if ($eventId === 0) {
                continue;
            }

            $serviceRoles = $this->extractServiceRoles($this->getEventServices($eventId));
            $service = $this->upsertService($event, $serviceRoles);

            $songSummary = $this->syncServiceAgendaSongs((int) $service->id, $eventId);

            $summary['services_count']++;
            $summary['songs_count'] += $songSummary['songs_count'];
            $summary['matched_songs_count'] += $songSummary['matched_songs_count'];
            $summary['unmatched_songs_count'] += $songSummary['unmatched_songs_count'];
        }

        return $summary;
    }

    public function syncSongs(): int
    {
        $songs = $this->fetchSongs();
        $count = 0;

        foreach ($songs as $song) {
            $ccliId = $this->normalizeCcli($song->getCcli() ?? null);
            if ($ccliId === null) {
                continue;
            }

            DB::table('songs')->updateOrInsert(
                ['ccli_id' => $ccliId],
                [
                    'title' => (string) ($song->getName() ?? ''),
                    'updated_at' => Carbon::now(),
                    'created_at' => Carbon::now(),
                ]
            );

            $count++;
        }

        return $count;
    }

    public function syncAgenda(int $eventId): mixed
    {
        $fetcher = $this->agendaFetcher ?? function (int $id): mixed {
            $this->configureApi();

            return EventAgendaRequest::fromEvent($id)->get();
        };

        return $fetcher($eventId);
    }

    public function getEventServices(int $eventId): array
    {
        $fetcher = $this->eventServiceFetcher ?? function (int $id): array {
            $this->configureApi();

            $event = EventRequest::find($id);

            return $event?->getEventServices() ?? [];
        };

        return $fetcher($eventId);
    }

    private function fetchEvents(): array
    {
        $fetcher = $this->eventFetcher ?? function (): array {
            $this->configureApi();

            return EventRequest::where('from', Carbon::now()->toDateString())->get();
        };

        return $fetcher();
    }

    private function fetchSongs(): array
    {
        $fetcher = $this->songFetcher ?? function (): array {
            $this->configureApi();

            return SongRequest::all();
        };

        return $fetcher();
    }

    private function configureApi(): void
    {
        if ($this->apiConfigured) {
            return;
        }

        $apiUrl = (string) Config::get('services.churchtools.url', '');
        $apiToken = (string) Config::get('services.churchtools.api_token', '');

        if ($apiUrl !== '') {
            CTConfig::setApiUrl(rtrim($apiUrl, '/'));
        }

        CTConfig::setApiKey($apiToken);

        $this->apiConfigured = true;
    }

    private function upsertService(mixed $event, array $serviceRoles): object
    {
        $ctsEventId = (string) $event->getId();

        DB::table('services')->updateOrInsert(
            ['cts_event_id' => $ctsEventId],
            [
                'title' => (string) ($event->getName() ?? ''),
                'date' => Carbon::parse((string) $event->getStartDate())->toDateString(),
                'preacher_name' => $serviceRoles['preacher'],
                'beamer_tech_name' => $serviceRoles['beamer_technician'],
                'last_synced_at' => Carbon::now(),
                'cts_data' => json_encode($this->extractRawData($event), JSON_THROW_ON_ERROR),
                'updated_at' => Carbon::now(),
                'created_at' => Carbon::now(),
            ]
        );

        return DB::table('services')
            ->where('cts_event_id', $ctsEventId)
            ->firstOrFail();
    }

    private function syncServiceAgendaSongs(int $serviceId, int $eventId): array
    {
        $agenda = $this->syncAgenda($eventId);
        $agendaSongs = method_exists($agenda, 'getSongs') ? $agenda->getSongs() : [];

        $summary = [
            'songs_count' => 0,
            'matched_songs_count' => 0,
            'unmatched_songs_count' => 0,
        ];

        $songMatchingService = app(SongMatchingService::class);

        foreach ($agendaSongs as $index => $song) {
            $ctsSongId = (string) ($song->getId() ?? '');
            if ($ctsSongId === '') {
                continue;
            }

            $ccliId = $this->normalizeCcli($song->getCcli() ?? null);

            DB::table('service_songs')->updateOrInsert(
                [
                    'service_id' => $serviceId,
                    'order' => $index + 1,
                ],
                [
                    'cts_song_name' => (string) ($song->getName() ?? ''),
                    'cts_ccli_id' => $ccliId,
                    'updated_at' => Carbon::now(),
                    'created_at' => Carbon::now(),
                ]
            );

            $serviceSong = \App\Models\ServiceSong::where('service_id', $serviceId)
                ->where('order', $index + 1)
                ->first();

            $matched = false;

            if ($serviceSong !== null && $serviceSong->cts_ccli_id && ! $serviceSong->song_id) {
                $matched = $songMatchingService->autoMatch($serviceSong);
            } elseif ($serviceSong !== null && $serviceSong->song_id) {
                $matched = true;
            }

            $summary['songs_count']++;

            if ($matched) {
                $summary['matched_songs_count']++;
            } else {
                $summary['unmatched_songs_count']++;
            }
        }

        return $summary;
    }

    private function extractServiceRoles(array $eventServices): array
    {
        $roles = [
            'preacher' => null,
            'beamer_technician' => null,
        ];

        foreach ($eventServices as $eventService) {
            $serviceName = Str::lower((string) ($eventService->getName() ?? ''));
            $personName = $this->extractPersonName($eventService);

            if ($personName === null) {
                continue;
            }

            if ($roles['preacher'] === null && (str_contains($serviceName, 'predigt') || str_contains($serviceName, 'preach'))) {
                $roles['preacher'] = $personName;
            }

            if ($roles['beamer_technician'] === null && str_contains($serviceName, 'beamer')) {
                $roles['beamer_technician'] = $personName;
            }
        }

        return $roles;
    }

    private function extractPersonName(mixed $eventService): ?string
    {
        if (! method_exists($eventService, 'getPerson')) {
            return null;
        }

        $person = $eventService->getPerson();
        if ($person === null) {
            return null;
        }

        if (method_exists($person, 'getName')) {
            $name = trim((string) $person->getName());

            if ($name !== '') {
                return $name;
            }
        }

        $firstName = method_exists($person, 'getFirstName') ? trim((string) $person->getFirstName()) : '';
        $lastName = method_exists($person, 'getLastName') ? trim((string) $person->getLastName()) : '';
        $fullName = trim($firstName . ' ' . $lastName);

        return $fullName === '' ? null : $fullName;
    }

    private function extractRawData(mixed $event): array
    {
        if (method_exists($event, 'extractData')) {
            return $event->extractData();
        }

        return [
            'id' => $event->getId() ?? null,
            'title' => $event->getName() ?? null,
            'startDate' => $event->getStartDate() ?? null,
            'note' => $event->getNote() ?? null,
        ];
    }

    private function normalizeCcli(?string $ccli): ?string
    {
        if ($ccli === null) {
            return null;
        }

        $value = trim($ccli);

        return $value === '' ? null : $value;
    }

    private function writeSyncLog(string $status, array $summary, ?string $message, mixed $startedAt, mixed $finishedAt): void
    {
        DB::table('cts_sync_log')->insert([
            'status' => $status,
            'synced_at' => $finishedAt,
            'events_count' => $summary['services_count'] ?? 0,
            'songs_count' => $summary['songs_count'] ?? 0,
            'error' => $message,
            'created_at' => Carbon::now(),
            'updated_at' => Carbon::now(),
        ]);
    }
}